Patents by Inventor Stunehiro Endo

Stunehiro Endo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Speed control apparatus for a brushless direct current motor
    Patent number: 4855652
    Abstract: AC power supply is converted to DC by a rectifier circuit. The DC is stepped up by a step-up chopper circuit. The output of the step-up chopper circuit is smoothed by a smoothing circuit. The output of the smoothing circuit is input to an inverter via a current detecting circuit and a voltage detecting circuit. A synchronous motor is connected to the inverter. When the speed of the synchronous motor is judged to be in a high speed region based on the output signal of the voltage detecting circuit, the first speed control apparatus operates the interrupting control of the switching element of the step-up chopper circuit in such a manner that a deviation speed between an instruction speed signal to the motor and the detected speed of the motor reaches to zero.
    Type: Grant
    Filed: January 25, 1988
    Date of Patent: August 8, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Koujirou Yamashita, Stunehiro Endo, Kunio Miyashita, Susumu Kashiwazaki, Kenichi Iizuka